Leaf discharge and operating and locking means therefor



Jul 7, 19251 545,086

N. K. DAVIS LEAF DISCHARGE AND OPERATING AND LQCKING MEANS THEREFORFiled Sept. 27, 1924 Patented July 7, 1925.

NORRIS K. DAVIS, OF SAN FRANCISCO, CALIFORNIA.

LEAF DISCHARGE AND OPERATING AND LOCKING MEANS THEREFOR.

Application filed September 27, 1924. Serial No. 740,183.

To all whom it may comer Be it known that I, Noiuzrs K. DAVIS, a citizenof the United States, residing at the city and county of San Francisco,State of California, have invented certain new and useful Improvementsin Leaf Discharge and Operating and Locking Means Therefor, of which thefollowing is a specification.

The present invention relates to an improvement in concrete mixers andespecially to the means for operating the leaf discharge. Heretofore theleaf discharge had to be held in operative position by the attendant,otherwise the weight of the material falling upon the same, from therotating mixing drum, would throw the leaf downward, and out ofoperative position.

The object of the present invention is to provide a means whereby theleaf on being manually placed in discharge position, is locked thereinand so remains until the same is placed in inoperative position by saidattendant.

With the above mentioned and other objects in view, the inventionconsists in the novel construction and combination of parts hereinafterdescribed, illustrated in the accompanying sheet of drawings, and setforth in the claim hereto appended, it being understood that variouschanges in form, proportion, size and minor details of constructionWithin the scope of the claim may be resorted to without departing fromthe spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings Figure 1 is a view in perspectiveillustrating the preferred embodiment of the invention.

Figure 2 is a vertical cross section through the mixing drum and alongitudinal section through the leaf discharge, showing the operatingand locking means in elevation.

In the drawings wherein like characters of reference designatecorresponding parts, 1 indicates a frame upon which is mounted aconventional type of concrete mixer. Said mixer is operated by means ofany suitable power device, such as is indicated at 2. The power soemployed also operates the rotary mixing drum 3, the skip 4 beingoperated by suitable means comprising in part, the

.windlass 4 and cables 4', further details being omitted as forming nopart of the present invention.

Carried by the frame 1 is the superstruc ture 5 upon which is mounted,by means 01 the bearings G, the horizontally disposed shaft 7, carryingat one of its ends the manually operated lever 8, and at the other endcarrying a sprocket 9. In spaced relation upon the shaft 7 are connectedone end of the toggles 1010, which connect at their opposite ends with aleaf discharge 12 at points 1111. Said leaf discharge is of the ordinaryconventional type now in use at the present time, the greater portion ofwhich extends into the interior of the rotary drum 3 through thedischarge opening 13. Said leaf discharge is pivotally suspended atpoint 14 from a bracket 15 carried by the superstructure 5.

The toggles 10 and 10, due to their flexing, provide a locking meanswhen the lever 8 is moved to throw the leaf discharge into and out offunction.

011 the back of the superstructure 5, opposite to the sprocket 9, ismounted a horizontally disposed shaft 17, carrying at one of its ends ahand wheel 18, and at the other end carrying a sprocket 19. These twosprockets 9 and 19 are connected by a chain 20, thus providing a meanswhereby the leaf discharge may be operated if desired from the skip sideof the machine.

To operate the device set forth in the drawings, the attendant throwsthe lever S downward, thus flexing the toggles 10 and 10 from theirnormal position to a downward position. This forces the inner end of theleaf discharge 12 upward Within the rotary drum, and the exposed enddownward, thus placing the same in operative position. To return theleaf discharge to inoperative position the lever 8 is moved upward thusforcing the toggles to their normal position, which in turn forces theinner portion of said leaf discharge 12 downward, throwing the exposedend upward, thus rendering the same inoperative. It is to be understoodthat the lever 8 may be operated directly by the attendant; or ifconvenient, the operation may be effected from the skip side of themachine by means of the hand wheel 18 which through the chain 20 turnsthe sprocket 9 actuating the shaft 7.

To retain the lever 8 in raised position I provide a spring pressedroller or other means 21 carried by the frame 5 and disposed in the pathof the lever 8. On the upward movement of the lever the same springsover the member 21, which retains the leaf in inoperative position. Byproviding a spring pressed member 21 I am enabled to operate the leafdischarge from either side of the apparatus.

I claim In a concrete mixer and in combination with its mixing drum andtiltable leaf discharge associated with said drum; means for operatingsaid leaf discharge comprising a rock shaft on the front of the machine;toggles connecting said shaft with the leaf d'1s charge adapted to locksaid leaf discharge in operative discharging position; a lever on oneend of the rock shaft; a sprocket mounted on the other end; a hand Wheelat the back of said machine a power transmitting connection between saidhand Wheel and said sprocket and a spring latch adapted for releasablyholding the lever in its upper position.

In testimony whereof I have signed my name to this specification.

NORRIS K. DAVIS.

